human anatomy final
Cardiac Muscle Characteristics
Cardiac muscle fibers are branched and contain one nucleus.
Striated and intercalated discs are present with gap junctions, allowing for quick communication between cells.
Found only in the heart, enabling it to pump blood throughout the body.
Involuntary and has a rhythmic contraction, allowing the heart to function independently of conscious control, with a generally slow contraction rate.
Types of Cartilage
Articular Cartilage: A thin layer of hyaline cartilage found on the epiphyses (ends) of bones, primarily to reduce friction in joints.
Fibrocartilage: Found in intervertebral discs, pubic symphysis, and menisci, it provides support and can withstand pressure.
Elastic Cartilage: Found in structures such as the ear and epiglottis, this type provides rigidity while also allowing for flexibility.
Connective Tissue
Exhibits a well-vascularized structure with an extensive extracellular matrix that provides support and binds other tissues together.
Examples of physiological responses to connective tissue:
Childbirth: Stretching of the uterine walls during contractions.
Lactation: Milk production is stimulated during feeding.
Ovulation: Release of estrogen in preparation for potential fertilization.
Blood Clotting: Platelets release clotting factors to heal injuries.
Cellular Junctions
Tight Junctions: Prevent leakage of fluid between cells, maintaining tissue integrity.
Upper Extremity Bones
Comprises major bones including the humerus, radius, ulna, carpals, metacarpals, phalanges.
Shoulder Girdle Bones
Includes the scapula and clavicle, connecting the upper limb to the trunk.
Lower Extremity Bones
Involves the femur, tibia, fibula, patella, tarsals, metatarsals, phalanges, providing structure and movement.
Pelvic Girdle Bones
Consists of two coxal bones (iliac, ischium, pubis), the sacrum, and the coccyx, supporting the framework of the lower body.
Proximal vs. Distal
Proximal: Closest to the point of attachment of the extremity.
Distal: Farthest away from the point of attachment of the extremity.
Neurotransmitter Release
Released from the nerve when the nerve impulse reaches the end of the axon terminal, crucial for inter-cell communication.
Keratin Function
Keratin: A structural protein found in the skin responsible for waterproofing and providing protective barriers.
Muscle Tissue Connective Wrappings
Endomysium: Encloses a single muscle fiber; supports muscle regeneration and force transmission during contractions.
Perimysium: Wraps around fascicles of muscle fibers; allows for nutrient supply and communication with blood vessels/nerves.
Epimysium: Covers the entire skeletal muscle, protecting it from friction and facilitating force transmission.
Fascia: Outermost dense connective tissue covering muscles, groups, and vessels; binds structures together.
Thoracic Cavity
Contains vital organs such as the heart and lungs, encased by the rib cage.
Organic Compound: Enzyme
Enzymes are specialized proteins or molecules composed of amino acids that catalyze biochemical reactions.
Tarsal Region
Comprises short bones in the ankle that facilitate movement and support.
Epiphyseal Plate
Allows for longitudinal growth in children and ossifies into an epiphyseal line when fully grown, indicating growth plate closure.
Skin Layers and Fingerprints
Stratum Lucidum: Found in palms and soles where fingerprints and footprints are developed, acting as a protective layer.
Fontanels in Infants
Soft spots on a baby's skull allowing flexibility during birth and brain growth, facilitating the passage through the birth canal.
Atlas Vertebra
The first cervical vertebra (C1), supports the skull and allows for nodding movements.
Cross-Bridge Formation
Myosin heads attach to actin, forming a cross-bridge during muscle contraction, essential for muscle movement.
Antagonist Role in Muscles
Muscles that oppose the agonist to maintain balance and ensure smooth movements.
Motor Unit
A motor neuron and the muscle fibers it stimulates, crucial for muscle contraction.
Flagellum
A long whiplike structure used for movement by certain tiny plants and animals; most commonly seen in sperm and bacteria.
Tubercle Function
A small rounded projection on a bone; serves as an attachment point for muscles, tendons, or ligaments, providing leverage and support during movement.
Exocrine Glands
Secrete substances via ducts (e.g., sweat, saliva, bile, digestive enzymes) to the body's exterior.
Physiological Studies Focus
Concentrate on how different body systems work and interact under normal and pathological conditions.
Hematopoiesis
The formation of blood cells in red bone marrow, crucial for maintaining adequate blood cell levels.
Tissue Regeneration
The biological process of replacing damaged cells and restoring tissue function.
Hydrolysis Reaction
A chemical reaction where larger molecules (polymers) are broken down into smaller molecules (monomers) through a reaction with water, often important in digestion.
Foramen Magnum
The large opening at the base of the occipital bone, allowing for the passage of the spinal cord.
Scar Tissue Composition
Composed mainly of fibrous tissue and collagen fibers, formed as part of the healing process.
Greenstick Fracture Description
An incomplete bone fracture occurring similarly to a breaking twig; most common in children due to their flexible bones.
Haversian Canal
Contains blood vessels and nerve fibers supported by loose connective tissue, allowing bone to receive oxygen and nutrition.
Hamstring Movements
Produces flexion of the knee joint and extension/rotation of the hip joint, essential for locomotion.
Physical Signs of Melanoma
Include new or abnormal moles, crusty moles, changes in existing moles, non-healing sores, and fatigue indicating potential skin cancer.
Acid Definition
A chemical that gives off hydrogen ions in water with a pH less than 7 and forms salts when combined with metals.
Muscular Functions
Include thermoregulation, protection, movement, posture, and stability to maintain balance and body integrity.
ABCDE Rule for Melanoma
A guide for identifying melanoma signs: A (asymmetry), B (border inequality), C (color), D (diameter), E (evolving).
Isometric Contraction
Muscle tension increases without shortening, producing no movement while maintaining muscle length.
Osteocyte Location
Found inside lacunae of developed cortical bone tissue in the Haversian system, playing a role in bone maintenance.
Nails Composition
Made of keratin, a tough protein providing structure and toughness to protect fingertips.
Vitamin D Activation
Activated in the skin when exposed to UV light, crucial for calcium absorption and bone health.
Anaerobic Glycolysis Description
Breaks down glucose without oxygen to produce pyruvic acid, yielding 2 ATP quickly, leading to muscle fatigue due to lactic acid accumulation.
Hinge Joint Function
Allows movement in one direction, similar to a door (e.g., elbow and knee) enabling flexion and extension movements.
Abdominopelvic Cavity Regions
Divided into four quadrants: right upper, left upper, right lower, left lower; nine regions are defined by specific arrangements of body parts for easier diagnosis.
Skeletal Muscle Fatigue
Results from anaerobic respiration that creates lactic acid accumulation, leading to fatigue in muscle function.
Intercalated Discs in Cardiac Muscle
Specialized structures that connect individual cardiac muscle cells using connexon proteins to ensure synchronized contraction for efficient heart function.
Skin Color Pigments
Hemoglobin (red), carotene (yellow), melanin (brown) contribute to the coloration and protection of the skin.
Abduction vs. Adduction
Abduction: Movement away from the midline (e.g., arm lifted); Adduction: Movement towards the midline (e.g., adding limb back to the body).
Smooth Muscle Description
Described as involuntary, single nucleus, non-striated muscle found in hollow organs to facilitate organ movement.
Histology of the Skin
Composed of two layers: epidermis (stratified squamous epithelium) and dermis (loose areolar and dense irregular connective tissue), with a subcutaneous layer beneath for insulation and cushioning.
Stages of Bone Fracture Healing
Phases include hematoma formation, fibrocartilage callus formation, bony callus formation, and bone remodeling to restore integrity.
Epithelial Tissue Naming System
Based on the number of layers (simple/stratified) and shapes (squamous/cuboidal/columnar).
Mechanical Force of Muscle Contraction
Occurs when actin and myosin filaments slide past each other in the muscle sarcomere, leading to generation of force.
Mucous Membranes Location
Line body cavities open to the exterior (e.g., mouth, nose, digestive tract), serving as a protective barrier.
Body Section Types
Midsagittal: divides left and right equally; Sagittal: divides left and right; Frontal/coronal: anterior and posterior; Transverse/cross: superior and inferior.
Bone Composition
Comprised of osseous connective tissue made from calcium, phosphorus, and collagen proteins which provide strength and structure.
Osteoblasts and Osteoclasts Functions
Osteoblasts: create new bone; Osteoclasts: dissolve and break down old bone tissue, working side by side to maintain bone health and homeostasis.
Serous Membranes Description
Line cavities close to the outside, separated by serous fluid, allowing organs to slide by each other without friction (e.g., peritoneum, pleura, pericardium).
Tailbone Name
Coccyx, the terminal part of the vertebral column.
Hair Shaft Part
The part of the hair that the hair shaft extends from the scalp/skin, critical for growth and protection.
Ossification Definition
The natural process of bone growth and formation, turning cartilage into bone tissue.
Layers of the Epidermis (Superficial to Deep)
Stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, stratum basale.
Epithelial and Connective Tissue Membranes
Epithelial: mucous, serous, cutaneous; Connective: synovial, which lines joint spaces.
Transitional Epithelium Location
Found in structures of the urinary system such as bladder, ureters, urethra, allowing for stretching.
Chondrocytes Function
Cells responsible for forming cartilage, crucial for endochondral ossification and bone development, aiding in growth and repair of skeletal tissues.
Sudoriferous Glands Description
Help excrete waste and regulate body temperature; Eccrine glands open onto skin surface for cooling; Apocrine glands contribute to body odor.
Tibia
Known as the shin bone, supporting weight and providing structure to the lower leg.
Cervical Vertebra Characteristics
Identifiable by a smaller oval shape with a triangular vertebral foramen and three foramina for the passage of blood vessels.
Synthesis Reactions Description
Promote cell growth and repair of worn-out tissues through anabolic processes.